Anti-PIV type 2, 3 Polyclonal antibody

A method for the experimental characterization of the velocity, hydrodynamic pressure, and acoustic generation in a subsonic (Re-H = 25, 500), three-dimensional, turbulent wall jet is presented. An acoustic analogy formulated for the turbulent wall jet shows that the far-field acoustics relate to the Reynolds stress fluctuations of the velocity field or the product of the hydrodynamic pressure fluctuations and the rate-of-strain field. As these quantities cannot be measured directly with sufficient resolution, low-order reconstructions of the velocity field based on the use of the Proper Orthogonal Decomposition and Stochastic Estimation are developed. Reconstruction of the three-dimensional field is accomplished using spanwise-aligned, stereoscopic particle image velocimetry measurements, obtained at 16 streamwise locations synchronously with an array of 32 surface pressure transducers. The velocity field reconstruction is then used to calculate the fluctuating pressure field (via Poisson's equation) allowing for the evaluation of coupled pressure-velocity terms in addition to an acoustic analogy for the acoustic far-field. Application of these methods show that the large-scale motion throughout the shear layer is captured by the velocity and hydrodynamic pressure field estimates and features of the acoustic far-field are recovered.

This paper introduces a novel fan-shaped plasma reactor, which employs vortex-induced airflow by atmospheric dielectric barrier discharge to enhance mixing and the resulting distribution of the neighboring species of generated ozone. Through stereoscopic PIV and smoke flow visualizations it was demonstrated that mechanisms of suction, vortex creation and ejection of the fluid combine to form a vertical turbulent flow that yields a more controlled and uniform ozone distribution. The performance of the fan reactor was compared to that of a conventional comb reactor for three cross-sectional planes of a space volume simulating the decontamination environment. Results show that with the fan reactor, ozone starts spreading from the center of the plane, which makes the reactor itself responsible for most of the mixing and ozone's distribution pattern; whereas in the case of the comb reactor, mixing seems to be mostly dependent on the interaction between the reactor's characteristic flow and the boundaries of the space volume.